Reamer



1933- J. D. TUCKER 1,923,177

REAMER NNNNNN O R c]. D Tucker Patented Aug. 22, 1933 BEAMER Jesse D. Tucker, North Sacramento, Calif alsignor to Tucker-Gilmore Mfg. Company, North Sacramento, CaiiL, a Corporation of California Appiication December 15, 1930 Serial No. 502,301

2 Claims. (Cl. 7767) This invention relates to reamers, my main vided with a deep recess 6 which extends lengthobjects being to provide a reamer which will be wise of the body the full length of the cutting stronger than the multiple flute reamer now edge and which extends around the body from commonly used; and which will not tend to be said edge toward the termination B; the periphchipped or broken; one which provides for easy cry of the body from the end of the recess op- 80 escape of the metal particles cut or reamed out; posite the cutting edge of the termination B being and one which is formed so that its leading or preferably disposed in relieved or eccentric relacutting edge engages the metal of the hole at 9. tion to the axis of the reamer, as shown at 'I, so constant and natural cutting angle, while at the that this portion of the body does not touch the 10 same time the reamer will be always maintained metal about the hole. The circumferential or 5 properly centered in the hole. The reamer may arcuate distance between the cutting edge and be made of'any size and of either straight or the termination B on the side of the reamer is tapered form, and will perform with equal emsomewhat less than 180 degrees. ciency in any size or form. It will therefore be seen that by reason of this A further object of the invention is to produce construction the reamer has what may be con- 70 a simple and inexpensive device and yet one sideredathree-point engagement or contact with which will be exceedingly effective for the purthe hole. namely, the cutting edge and the ter pose for which it is designed. minations or points A and B; the portion 3 These objects I accomplish by means of such throughout its extent of course following the constructure and relative arrangement of parts as tour of and ctually bein in firm en agem nt 75 will fully appear by aperusal of the following with the metal about the hole. The resistance specification and claims. to the cutting edge offered to the rotation of the In the drawing similar characters of reference reamer and tending to deflect the reamer latindicate corresponding partsinthe several views: erally may be considered as being taken up or Fig. 1 is a side elevation of a taper reamer concounteracted at the point A, which in effect forms 80 structed according to my invention. a rest; while firm engagement of the reamer with Fig. 2 is an enlarged typical cross section of the the metal of the hole at the point B prevents ma possible deflection of the cutting edge trans- Fig. 3 is a typical cross section of a straight versely and a y from the p ip y t e hole.

reamer constructed according to my invention, The three main bearings points 4, A, and B, ex- 85 and provided with acfiustable gibs whereby the tend about an are preferably greater than 180 working size of the reamer may be increased degrees, so that there is no tendency for the reamsomewhat. er to ever lose its centralized position in the Referring now more particularly to the charhole. As a result of the above features therefore acters of reference on the drawirig, and particua clean cut is made, the chips have easy exit 90 larly at present to Figs. 1 and 2, the body 1 of through the relatively large recess, and the reamthe reamer is of taper form and is integral as er is always centralized in the hole, so that the usual with an end shank 2 arranged for conneclatter is reamed to a true circle which is always tion to a chuck or other turning device. The concentric with the original hole. Also there is body for its full length is circular and concentric no tendency for the reamer to chatter when in 95 with its axis only for a circumferential distance operation. approximating or slightly greater than 90 de- The same results may be obtained in a straight grees, as shown at 3; the limits of the concentric reamer, the cross section of the body in of which portion being denoted at A and B. Around the is shown in Fig. 3. With such a reamer I may body an arcuate extent a few degrees less than use the radially adjustable gibs or flutes 8 which degrees from the termination A of the conare sometimes employed in standard reamers. centric portion, is the cutting or leading edge 4 These gibs are disposed in substantial alinement of the reamer, which edge of course extends from with radial lines A1 and B1 whose arcuate end to end of the body. .This edge is in the same spacing relative to each other and to the cut- 50 circle as the portion 3; the periphery of the body ting edge 4a corresponds to the positions of the between said edge and the termination A being points A and B in the first described type. These relieved as shown at 5, so that the cutting edge gibs therefore when projected from the body of the reamer is disposed in chisel-like relation form two of the bearings or resistance points to the peripheral metal of the hole being removed. and function the same as the bearing points A 66 The body head of the cutting edge is pro and B.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the-objects of the invention as set forth herein.

5 While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detailmayberesortedtoasdonot form adeparture from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claimasnewandusefulanddesiretosecm'e by Letters Patent is:

1. A reamer comprising a body provided with a longitudinal recess in one side to form spaced cutting and following edges with the periphery of the body, the cutting edge and an arcuate portion or the body greater than in extent and having its inception less than 90 back of the cutting edge lying in a common circle concentric with the axis of rotation of the reamer and the periphery of the body being depressed relative to said circle fran the cutting edge to the ad- Jacent end of said arcuate concentric portion, and Irom the opposite end of said portion to the following edge.

2. A reamer comprising a body provided with a longitudinal recess in one side to form spaced cutting and following edges with the periphery of the body, there being a point on the periphery otthebodyanarcuatedistancenotlessthan back of the cutting edge which lies in a common circle with the cutting edge and concentric with theaxisofthereamenthere being also anotherpointontheperipheryotthebodyalso lying in said circle and disposed between said first point and the cutting edge an arcuate distance less than 90 from the latter; the periphery of the body bemg depressed relative-to said circle between the last named point and the cutting edge and between said first named point and the following edge. JESSE D. TUCKER.

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